![]() Over the course of 2 years, no bolt has loosened. ![]() (8, 9) On all bolts, we used blue Loctite. (5, 6, 7) To secure the solar panels to the unistrut crossbars, we used 3/8″ bolts, external tooth lock washers, and nylon unistrut cone nuts. This allows each section of unistrut to be securely mounted to 2 Vantech adapters. This way, it spans the 12′ length of the roof. So, we cut the 10′ unistrut in half and created a 2′ gap in the middle (3). Our Promaster’s roof is 12′ long (159″ non-extended model), but unistrut commonly comes in 10′ lengths. Picture 4 shows the 3/4″ diameter washers that solidly extend across the holes in the unistrut. We did not use the washers from Vantech (they are too small). (2, 3, 4) The unistrut side rails mount to the Vantech roof mount adaptors using Vantech’s included bolts. You may be able to source powdercoated unistrut from a local specialty building store, but our spray paint job has already lasted a year and still looks great! Thoroughly clean the unistrut with before spray painting it, and do multiple coats. For this installation, we bought 5 pieces of gold galvanized unistrut from HD/Lowes (in the electrical section), then spray painted it with Rustoleum semi-gloss black spray paint. The unistrut used for the crossbars is 13/16″. The unistrut for the side rails is 1-5/8″. (2, 3, 4) First, purchase the Unistrut (also branded as Superstrut). How to Build a Unistrut Solar Panel Roof Rack on a Van Step-by-step Instructions Bold numbers refer to pictures in slideshow
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